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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e594a1a99418b0f1fef3d781422cb2c3af30ce732dfab19a6b382a7f893cf23' 
  AND token = 'Vg23M1AWrZKBExGTqbi40Vn4o8PliCxXDfvQN2DawV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}